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03-04-2020, 09:57 PM | #1 |
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Revving at idle?
When at idle intermittently revs from about .5 - 1k..
any clues what this could be? Car is a 2016 , about 40K, delicious stg 2 tune (although back to stock header). |
03-04-2020, 09:59 PM | #2 |
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Do you have the ac on?
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03-04-2020, 10:00 PM | #3 |
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03-04-2020, 10:36 PM | #4 |
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Idle will change as the compressor turns on and off.
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03-04-2020, 10:51 PM | #5 |
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Lol oddly my rpm drops at idle with the ac on. It goes from 900 to 500 then 2 seconds later it up to 900 -ish. But mines a 2013 and it's an known issue from Subaru, not really a problem but if I recall there is a tbs or whatever it's called from the dealer.
As to your problem it's gotta be the tune. That's something I don't know jack about. Hopefully others would chime in on that.
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03-05-2020, 02:27 PM | #6 | |
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Quote:
Had this same issue on my car (no ac. Almost never use it) and it went away after flashing my ECU to stage 1 with the OFT. it's smoother than ever now.
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03-05-2020, 02:38 PM | #7 |
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The AC doesn't even need to be on. If you have the HVAC dial set to the windshield (or a combo including it) and the fan on the compressor will still kick in even on a heat setting. The compressor kicks on to dry the air for more effective clearing of the windshield.
It is not at all uncommon with low displacement engines it is just a bit more noticeable with these.
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The Following User Says Thank You to Tcoat For This Useful Post: | wolffbite (03-05-2020) |
03-05-2020, 02:39 PM | #8 |
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Also worth noting that running the front defogger kicks on/off your AC compressor, which will cause a small RPM surge.
Edit: Tcoat beat me to it! |
The Following User Says Thank You to wolffbite For This Useful Post: | Tcoat (03-05-2020) |
03-12-2020, 11:26 PM | #9 |
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Do you know if there was an aftermarket header with the Sgt 2 tune? If it was tunes with that and you put the stock header back in that cause weird issues in AFR and causing your idle issues plus others possibly
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